Expansion reamer



Patented Dec. 8, 1925i UNITED EXPANSION EEAMER.

Application led Getober 1l, 1924.

To all whom it may concern:

Be it known that l, Cimnnns E. IIOCKING, a citizen of the United States, and a resident of Lancaster, in the county of Lancaster and the `State of Pennsylvania, have invented a new and useful Improvement in Expansion Beamers, of which the following is a specification.

My invention relates to expansion reamers and its principal Object is the provision of a ring or collar to hold the blades securely in place.

Another object of my invention is to produce a steady or follower ring to iiton the shank to hold the bevelled ends of the cutters, to give the cutters additional. support or strength and to prevent chattering of the cutters or blades.

Other objects and advantages of the invention will appear during the course of the following description taken in connection with the drawing.

Figure 1 is an elevation of the expansion reamer.

Fig. 2 is a longitudinal view partly in section.

Fig. 3 is a transverse sectional view of the i'eai'ner taken on line 3 3 of Fig. 1', and

Fig. t is a perspective view'of the steady ring.

Referring to the drawing in detail, where in similar characters of reference designate similaiparts throughout the several views, the numeral 5 designates a shank having the usual squared end. Running longitudinally of the shank 5 are a plurality of grooves 6 inclined as clearly illustrated in Fig. 2.

In the reamer head or cutting area 7 aie blades or cutters 8. Each is preferably of semi-high speed tool steel and tapered to lit into an inclined groove 6. The blades 8 are also tapered at each end as shown at 9. Adjusting nuts 10 are threaded to the shank 5.

Instead of the usual bevelled locking ring, I have devised a steady or follower ring 11. rIhe base edge of each ring or collar 11 is flat while the opposite edge has spaced notches 12 having bevelled faces 13 te @oact With tapered faces 9.

Serial No. 743,154.

Not only do the notches or slots 12 giveA In operation, the blades 8 lit into the grooves 6 and the steady ring or collar 11 is turned so that each notch or slot 1Q, engages end9 of the blade 8. rllhe adjusting nut 10 is then tightened against the base edge of the steady ring.

The purposes of the steady ring 11 should be apparent. It will support and protectthe ends 9 of blades 8. All the blades 8 are united into one supporting unit. rIlhe collar 11 and the end of each blade 8 is given the combined strength of the numerous blades. As the steady ring firmly holds the blades in cutting position, the adjusting nuts will not spin or break and furthermore the ring with its slots will prevent the blades from becoming loose and prevent the chattering of the blades. rI`he notches firmly secure each blade against radial movement and end thrust.

It is understood that the forni of my invention herein shown and desc 1ibed is to be taken as a preferred example of the saine, and that various changes in the shape, size and arrangement of parts may be resorted to Without departing from the spirit of the invention or the scope of the subjoined claim.

I-Iaving thus described my invention, what I claim as new and desire to secure and protect by Letters Patent in the United States is:

An expansion reanier comprising in combination, a` spindle, a 'plurality of longitudinal grooves in said spindle, a plurality of reamer blades longitudinally adjustable in the grooves, adjusting nuts threaded upon the spindle and disposed at opposite ends of the blades and steady rings received on the spindle and interposed between the nuts and blades, said rings being provided with notches in their outer edges adjacent the blades. each notch being beveled in the same plane as an end of a blade so as to receive the same.

CHARLES E. I-IUCKING. 

